Drawing instrument



July 8 1924. 1,500,246

A. w. KEUFFEL.

DRAWING INSTRUMENT Filed April 26 `1922 Patented July 8, 1924ie UNITED STATES 1,500,24t PATENT 4 oFFlcjE-,f

ADOLEW. KEUEEEL, oEMoN'rcLAIE rowNsn1 1=,EssEx COUNTY, NEW JERSEY, As- SIGNOR TOEEUEEEL e@ EssEE COMPANY, or HoEoKEN, NEW JERSEY, A ooEPoEA- TION OFf NEW JERSEY.

DRAWING INSTEMENT.

Application ined Apru 2e, 1922. Serial No, 556,767.

.To all 'whom t muy concern.; A f. Y. K

Be it known thatl, Anonr W. KEUEFEL, a citizen of the United States, residing at 763 Bloomfield Avenue, in the township of Montclair, `in the county of` Essex and VState of `New Jersey, have invented certain n'ew and usefulV Improvements ,in Drawing Instruments, of which the followingis a specificationL' ,fr l0 This invention relatesto an improvement s in drawing instruments'and the noveltyecon; sists ,in the adaptation and arrangement of the parts-vas willbe more fully hereinafter pointed out.,l j. Y j s, f s It has been found essential Jin theifconstruction ofcompasses `or dividers to' have the two legs secured together so that .there will always bean even tension inthe legs on moving them apart or closing them to,- gether, sothat they will remain in, the; position Ldesiredby the o peratorJj-It has also been yfoundessential thatthe vhandle of the compass or -divider shouldv also`be under an independent uniform tensionv so'that the handle Vwould remainin the position desired by the operator irrespective of theposition ofthelegs.A

' My devicenot only solvesthis difficulty by furnishing a pair of forkarms whichfare mountedunder afuniform tensionindependently of the tension of the legs, but lalso furnishesafsuitahlejointin both legs so that the lower leg may be set'perpendicularly to the paper, thereby giving the instrument a symmetrical appearance and a perfect balance. My device also furnishes leg joints of even tension which do not require adjustment.

Referring to the drawing Figure 1 is a front elevation of my dividers;.Figure 2 is a side elevation of the same; Figure 3 is a front elevation of my Compasses, and also showing in dotted outline the legs spread apart and with the lower legs inthe perpendicular position; Figure 4 is a side elevation of the same; Figure 5 is a pers ective of the spring used in connection wit the handle of the compass and divider; and Figure 6 is a sectional detail of the head ofthe legs and the mounting of the handle of my compass and divider,

In the drawings 7 and 8 are cylindrical tapered legs of the dividers shown in Figures 1 and 2, which have shoulder members 9 and 10 respectively, and said shoulders 9' and 10 have mounted therein pins 48 and49', respectively, each` terminating in pintles 11 and 48,"over which the spring fork arms'12 slide Vhaving recesses 13v into which the pintles 11 are adapted to` register and be held by the spring pressure, of the arms 12. The pin 49 is also long enough to extend-"into the opening in the shoulder 9, in which pin 48 is mounted and therebyserves tovalign the *shoulders 9( and 1QA perfectly; A' spring 14 -havingal slot ,15, and a holev 16 is adapted to bemounted between'the arms .12 so that`a screw 17, mounted yin the lowerfend ofL sa id armsl12. sofas to hold they same togetherAY ina fixed position', also passes through'the 'hole 16k in saidspring 14,and the slot15 slides 'overthepintle 11 sothat the spring 1,4 effects ,an constant spring pressure between the' shoulder 10Y and, thfarmY 12, "thereby effeoting a .uniform tension ,on ,thev` fork, arms 1,2.,` Afluted handle 18,"isy rigidly secured to the" fork arms 12. nThe shoulder 1,0"has Qa pocket 19 adapted to ,contain lubricant-to facilitate" the easy operation ofthe vlegs L7 and8. ,The leg 7 has aninsertarm 2O of usual construction secureda't the head lbya screw 21 and at the base by a knurl-headed adjusting screw 22, all of which" is constructed' for thepurpose of 'quick and minute 'adjustmentfofthe leg 7,1 Needlesri23, which have been previouslyfhardened to the condition "r'equir'efhy are mounted by'a drivefit in borings 24 inthe base of the legs-7 and 8. The legs 7 and 8 also have circular cut-outs 25 which are adapted to facilitate the operator in the handling of the dividers,

In Figures 3 and 4 is shown a compass having upper legs 26 and 27 which are also cylindrical and tapered, and to these are joined lower cylindrically tapered legs 28 and 29 respectively, said lower legs having circular shoulders 30 and tongue members 31 integral therewith. Said tongue members 31 are adapted to fit into grooves 32, which grooves 32 are extended by a narrower groove 33, so as-to give more spring to the members 34 formed by the grooves 32. Said members 34 and the tongues 31 have internal threaded borings 35 adapted to receive tapered screws 36. This construction permits the tapered screws 36 to be adjusted so that the hinges formed by the tongues 31 and grooves 32 may be readily used without further adjusting of screws 36. The lower legs 28 and 29 have borings 37 at their lower 42 is loosened and the needleor pencil points 43 are rigidly retained in working lposition by turning down the set screw 42, thereby drawing thel members 38 together to hold 43 in rigid position. The construction of shoulders 9 and 10 and the fork arms 12 and the connecting parts are all the same in the compass shown in Figs. 3 and 4 as in the dividers shown in' Figs. 1 and 2, and the spring 14 is mounted in the same way for the same purpose. The upper leg 27 has a separate part 44 nearits base which is detachable from the upper leg 27, and has a pentagonalshank 45 which fits asimilar socket 46 in the base of the upper leg'27, and a knurled setscrew 47 is mounted'inthe upper leg 27 so as to hold the shank 45 rigidly in position in the socket 46,butper mitting the disjoining of these parts when desired so that other parts maybe mounted therein.

4The cylindrical tapered form of the legs of .my compasses and dividers facilitates inthe handling ofthe instrument, yasthis form of leg fits the hand of theoperator readily, and thesp-ring 14 gives the fork arms 12 with the handle 18 anindependent tension at all times, which will not be varied by the changes in tension of the legs 7 and 8 ror 26 and 27. f

I claim:

1. In a drawing instrument the'V combination of two cylindrical tapered legs having circular shoulders adapted to fit together, pintles projecting Jfrom each of said shoulders outwardly, a fork headfwithtwo spring arms adapted to snap over said pintles and having Vrecesses on thel inside` adapted to receive the same, and a screw to fasten the lower end ofsaid fork arms together.

2. In a drawinginstr'umentthe' combination of 'two cylindrical taperedlegs having circular shoulders adapted to it together, pintles projecting from each of said shoulders outwardly, a fork head with two spring" arms adapted to snap over said pintles and havingrecesses on Vthe inside adapted toH receive the same, and a screw to Jfasten the lower ends of said fork armstegether, and means for eii'ecting an. Y. independent uniform tension on said fork head.V 3. In a drawing instrument the combina'- tion .of twocylindrical tapered legs having circular shoulders adapted to' fit together, pintles projectingl from each of said shoulders outwardly, a fork hea-d withltwo springV arms adapted.V to snap@` over said pintles and having recesseson the" inside adapted to 'receive the same, and screw to fasten the'lower ends'of saidlforkV armstegether; and Ameans for effectingan independent unitor'mtension on said" fork head i consisting' of a spring' mounted between said shoulders and said fork headV so as to mainftain a` unifcirinpressureagainst said' fork hea-d'. I

tionl of two legs having shoulders'adapted l'to ,fit together, means for maintainingpalign- Vment of said shoulders, afork head having 4. Ina drawing instrumentthe' combina 75 t arms adapted to snap overv said shoulders,

means for" pivoting said! shoulders between said fork arms, means 'for adjusting ,the tension on said shoulders, and independent means for maintaining a-uniform tension' on said fork arms.

In testimonywhereofl" aiii my signa.-

ture.

Anotrw: Karim .y 

